Also, it's not like this is a niche product. You're talking about something that has sold in the tens of millions and counting, ensuring they will be in the supply chain (eBay, flea markets, whatever) for at least the next 30 years or so.
Yes and no, in some ways I'd agree and other ways I wouldn't. I plan on getting myself a Sony PS2 when the PS3 comes out, as well as a reasonable collection of games and spare controllers, memory cards, etc. Why? Because after the system is superceeded, it will cease to be a mainstream product, and availability will slowly dry up, just like it has for other systems that people have moved on from. I learnt that lesson years ago when it came to consoles, ending up with a console that works perfectly asides from some fault such as a controller that was broken beyond repair and being unable to find a replacement.
In fact, that is a problem that affects older computers as well as consoles - my beloved Amiga 4000 is practically useless at the moment because the hard disk, floppy drive and mouse are all dead and beyond repair (at least, beyond any repairs I could do) and I have no idea where the keyboard that goes with it ended up, so before I can use it again, I have to replace the keyboard, mouse, floppy drive (and good luck finding one of the fairly rare 1.76Mb half speed 3.5" drives that were used in the A4000) and hard disk, then hope that the floppy disks I still have that I hadn't had a chance to backup to a different medium still work. Oh and then I'll want to replace the battery that started to leak onto the motherboard, so I removed it, but alas it took part of the battery mounting with it, so that needs to be repaired too if I want it to remember the date and time.
So if you're really worried, buy several of whatever machine you particularly like, as well as any things that plug into it like controllers, so you've got your own personal stash, saving you from being stuck like I am with my Amiga 4000.
Anyway, back to the topic.
I've been playing computer games for most of my life, from "Radar Rat Race" on the Vic 20 and "Star Raiders" and "Oils Well" on the Atari 400 to name just a few, right through to Gran Turismo 4 on the PS2. My favourites aren't usually the "itchy trigger finger" games, I particularly like games that make me laugh or think, and so the space quest series, as well as the monkey island series are among my favourites, but being a car enthusiast, I'm also a big fan of car racing game simulations such as the Gran Turismo series & live for speed, not really such a big fan of the more "arcade orientated" titles such as the need for speed series.