Re Into The Future Bug. I am not finding it too bad. With both my 'Grammar' Family and my 'Avengers' Family, I'm playing it on my laptop on which neither Showtime, nor Seasons nor Pets installed. Personally, I find it running a lot better without those three expansion packs, as I always found seasons annoying (and had it permanently on summer) and I never really got the handle on playing with pets. I don't even try to supermax any of the instruments, and so far I'm finding I'm having more than enough opportunities through work/school/special opportunities for the first three generations.
Gen 1 of the Avengers did most/all law enforcement career opportunities, Gen 2 did alchemy mastery and most/all business career opportunities, and Gen 3 has completed two of the secondary school opportunities and will do opportunities from his work. I'm doing my best not to let any of them do celebrity opportunities, as I'm leaving them until about Generation 7 and street art skill/appraisal career opportunities are being left for Gen 8. (though please do act surprised when we get there and the Gen 8 supermax is revealed).
To date Avenger Immortals have completed opportunities from Business and Law Enforcement (Forensic Branch) Careers. Painting/Fishing/Gardening/Cooking are all being left as open skills, so a latter Immortal can pop into Cooking if necessary. As is my usual practice, most of my immortals are doing Self Employed Careers as their qualifying level 10 careers and then swapping into a rabbithole career for opps and goodies.
There are lots of careers remaining for me to choose from, and at this stage don't see that I'll have that much of a problem with opportunities. 48 opportunities are needed and counting the list of opportunities at this page
http://simswiki.info/wiki.php?title=Game_Help:Sims_3_Opportunities there seems to be many more opportunities through the various base game rabbithole careers than 48.