I mostly agree with this. I would say "all things are possible with money" as that's really what the issue comes down to for most of us.
Also, re: "practice with the one you've got" I would amend to say "and if you don't already got then buy a M70 lightweight and a 1.x-Y optic of your choosing, put a ching sling on it, and go take Randy's PR class".
I also don't think the Aimpoint fills the bill for the "backup" thing. I go back to the "all things are possible with money" item and have to remind myself constantly that one of the criteria here for me, personally, is to not have a $3k custom rifle with $2k in glass since I'd be pretty upset if said rifle went missing or got broken. So, for me, adding a $600 optic/mount combo is (a) not really fitting the bill and (b) money I'd probably rather spend having irons installed.