I wish they'd copy the Evercade 'Retrocade' (iirc) console. That one has a console which you buy standalone game packs for, and the game packs usually have a few games on them (usually by publisher).
Take that style of console, but have Sega hardware cartridges to buy (ie: a 'Genesis' cartridge which contains Genesis classics, 'Sonic Bundle' sonic games, etc).