While playing I have noticed that since killing i'd say the 3rd dragon, encounters with dragons have become much more common. Just wondering if anyone has some sort of number of Dragon Encounters that I may run into before I run out, or will I run out? I'd hate to finish all of the Dragon Encounters prior to finishing main questline and stuff. If after main questline is finished it wouldn't feel like such a sin, but i'd still like to have the occurences until then. Anyone with input?

Just looking to see if anyone has found the answer to this yet as it would be good to know? Any input? Please?

I wouldn't be concerned. There's lots of seemingly random Dragon spawns, as well as the named Dragons, and the Mounts as well.

I've killed about 15 Dragons as of now, 3 of which were named. I'd say don't worry about it as long as you don't rush through the main quest.