Fewer players will just lead to fewer airliners with more bases and these airliners will be bigger. the result is, no change.
There are plenty of airports to start up at. As I have written earlier these are not LHR, FRA, LAX or JFK. And if you expect routes and cosutmer to served to you on a silverplate, well then to bad. This is a game. You have to work for your airline to be succesfull.
I just had a look at VGZR, Dhaka. One airline based there with just on Fairchild aircraft. out of Dhaka there are plenty of underserved markets with a huge potential. There are also routes unserved as of now. It looks like an interesting place to start up. But then again, if you expect to jump in at one of the big airports, do nothing to build up your airline. then this is just not a game for you.
I find it to be much more a joy to operateout of a small airport with a limited costumerbase. It is more difficult but more fun as well