TBH, if you are flighty enough to sell a bike you "loved" just because 'you
might need a part someday you can't get...' it's not a Buell problem.
I'm not being mean, some people like warranties and good on ya. These are not finicky older bikes, they just need the minimum of maintenance and a thoughtful hand. It amazes me how much people complain that 'My 20 year old bike has sat for a decade and needs a $300 fuel pump oh lawdy, lawdy, poor me!'. Ya, buy a 20 year old Ducati and know real pain. LOL
Yes, parts are still available (and still cheap). The bikes are the same, just a little older. Buy a nice example and the additional cost of entry will be paid back in spades.
IMO, if you "loved" your old one, you'll "love" your new one, so do it