The stuff you are talking about is entirely appropriate for MMORPGs not SINGLE-PLAYER RPGs.
Because of the way THIS game was designed monsters are of specific lvls so if you keep on lvling up and building your character eventually you will become so powerful you can sit there without armor while a deathclaw smacks you for 10 min straight and you won't die. Idk about you but I find that incredibly boring. God-mode is fun but if I wanted to have god mode I would punch in the console command.
Nice long post w/ lots of thoughts. However, I take special exception to the last part.
Now, let me explain something that you should LEARN yourself.

This isn't about the gaming companies, it's about sales. And sales come from giving the gamers what they want. If there are developers at Obsidian who take the attitude that they know better, the heck with what the gamers say they want, then they have to accept that their sales will suffer as a result ... and very quickly they'll be out of the game business because this is a VERY competitive industry.
Now, if I'm in the minority on this issue... then I lose. If the majority of players think customized slides at the end are more important to them than being able to play the game with their character for as long as they want in the way that they want, then I lose. Fine. If however most players believe, as I do, that they should have the option to continue with their character after the main story is over, then Bethesda and/or Obsidian shouldn't be surprised when sales dip and their reputations take a hit when they don't supply that.
And you know what? Even if every single poster on this forum said I was in the minority, I still wouldn't believe it because I see evidence to the contrary and this board is a small, small small small subset of the people who play these games. Bethesda's comments re: Fallout 3's unfortunate ending to me proves there was enough discontent and that most players wanted to play on.
If Obsidian made the game end because of the many NCR and Legion related quests around the wasteland that would suddenly be irrelevant, then they didn't think their story through very well. And to tell you the truth, there is nothing all that interesting about the FO:NV story... it lags well behind the main quest stories in FO3 and TES4.
(Quick Insert: Gear as carrots is not irrelevant to games like FO3... Borderlands understood this.)
Finally, if you are not allowed to continue your character, then what is the point of DLC expansions? Instead of being nice add-ons to the main game that expand game play, they'll be like mini-games that stand on their own... and that's lame. Imagine playing Mothership Zeta or Point Lookout with new characters... that would have been lame. They would not have expanded the FO3 world that way, you wouldn't be able to run back and forth between expanded areas and the main areas... just would have svcked.
Which means, moment of truth will be when new content is released. Either they'll have to allow you to keep playing past the main story, in which case you have to ask WHY they made us end now (probably $$$$ like the previous poster suggested)... or they'll have to take place earlier in the time line (which in effect forces many to start new characters), OR they won't involve the main character in which case they will be mini games and not expansions and that will be weak. In a case like that, I'd just pass on buying any downloads. The only download for Dragon Age that I didn't buy was the one where you can play as the bad guys at that main battle... it was the only one that didn't affect your main characters, and was pointless.