i think people would have used 98se for longer if it wasnt limited to 512mb ram. i saw the switch happen in my system builder days, we stopped using 98se and started using xp the day after i got the job. we were still putting 256mb in the buisness builds, but the computers we sold to students were shipping with 512 mb. a couple people requested a downgrade, one guy had some exotic professional audio hardware (i think he was a sound engineer) that just wouldnt work under xp, and another was just an old fogey that didnt like change. before i left we were doing 1gb, so we discontinued using 98.
i rather liked windows 98. it was a fun os. ive never ran into an install that wasnt plagued with viruses and glitches. viruses were an actual threat back then, not fear mongering to sell virus scanners. there was no security. for me that was a plus because i dont like security slowing me down, and i could run a tight ship. it was fun to fix and it was really fun when it went wrong. if it was in good shape, it was fast as ****. and it was built on dos so you could run all your dos games without any emulation.
im actually more impressed with the current ubuntu than i am with windows 8.1, if they are going to rape all my interfaces again its a good time to switch.