some ideas, in order of importance:
- considering atm my hardware still works good, 5x played with 2 pc (setup 1pc x main + 1pc x 4slaves), atm can delay hardware updgrades.
- considering the big chance to play by day 1 in cata with 50 level 80 toons: in wotlk i reached my 1st lvl 80 really late(about 7 months after wotlk launch, ulduar times), no chance to keep my toons at same average gear level then other ppl around.
- considering the my new (for me) great interest for pvp

i will continue for sure mboxing
and yes, i will play ++solo then what i did in wotlk.

PS: bought 5 digital cata upgrades yesterday