It seems to me that learning games and graphics on an old-hand set like C64/128 or Amiga (or anything else with limited hardware compared to today's big boxes) would be good practice and exercise for programming tomorrow's hand-helds.
Granted, within the next several years we'll see hand-helds with much greater power than today. We already have 400MHz and greater mobile processors like X-Scale and ARM, but many of these machines, while strong in the CPU area, lack large amounts of RAM and GPU capabilities.
Expand upon that. Making good icons for the Amiga could mean good money licensing those icons to Symbian, Palm, et al.
Make a good MOD and SID player which will run on a hand-held (J2ME, please, somebody?!) and you have a place for all these obsolete tracker skills.
Really, nothing's new in this world. We just have different ways of doing the same things.
Okay, that doesn't address the collector/buyer/loser issue. So I will say that collectors in ALL markets drive up the prices of remaining items. It's simple supply and demand, unfortunately. Cars, Happy Meals, Amiga, trading cards, comics, etc. We all know this, and even if we don't say so, somewhere deep inside we hates it, My Precious.