I just buy games on Ebay or Steam... (Preferably Ebay because Steam and I have a very love/hate relationship) and I can get pretty much anything that way. So it's not a problem for me as a PC gamer at all.
There are also some great deals on Ebay for new & sealed games being sold for about half the price it costs to buy them in stores (I'm serious, check it out. at least this is the case on Australian Ebay) so there's basically no point in me even entering a game shop anymore.. Only downside is waiting for the item to arrive and putting my trust in Ebay sellers, though I've not had any big issues with that yet.
As for games not actually being released for PC. Bullshit! Almost all of the best games that are out on the 360 are also out on the PC, or come out on the PC shortly after. Yes, we don't get quite as many games as console users, but if you want moar games just do what I do and buy a last-gen console as well. But yeah the 'PC gaming is dying' stuff has been going on for a long time and its total rubbish, PC gaming is a slower biz but we still get enough great titles unless you're the kind of person who's life revolves around gaming and you need a new game every day of the week, we do fine and we always will do fine.
I don't think a lot of console gamers really realise that we have access to most of their favourite titles on our PC's... Yes guys I finished Gears Of War, Mass Effect (and soon Mass Effect 2), Assassin's Creed (soon Assassin's Creed 2) Halo 1 & 2 (which were both shit though... oh and Halo 3 will be out on PC soon I believe), Bioshock, Resident Evil 5, DMC4, etc etc etccc... all with a mouse and keyboard