If they close, the only other place to get physical media would be WH Smith and supermarkets, which they generally only stock Top 40 stuff.
If HMV had embrace their online aspect a lot more, close down more stores to just big cities earlier, they might just survive. I mean didn't the whole Virgin/Zavvi saga teach them anything?
There is still GAME.. I bought FarCry 3 from them the other week.