Because rollerblading got boring. No I'm not joking, I'll probably get kooked for this but you asked and I don't care, and you specifically said rollerblading and the other thing. I used to be pretty serious about rollerblading from age 10 to around 25...I used to be on Be-mag forum, and I actually found out about slap from there back a while ago when there were silly things going on between this forum and that one.
Anyways, yeah it got boring...and I got burnt out, wasn't fun anymore. Always liked skateboarding I had friends that did it growing up, and messed around with it every so often but never seriously, using other people's boards etc, used to watch videos, was actually fairly knowledgeable of skateboarding even though I didn't do it. Until rollerblading got really boring and honestly for some reason it just got lame, everything about it got lame to me, I wasn't into doing it or watching people do it, friends were fading away from it or being weird about it, never liked the complaining whinny bs a lot of rollerbladers do over skateboarding and vice versa, or the "we deserve to have more representation" kind of talk yet always wanting to stay super core and not let anything in blah blah, there were a lot of reasons why I stopped...but mainly because I lost the desire to learn anything new, and didn't care to get it back . I only say those things because I wasn't just some rollerblader... I knew a lot of people around my country and in other countries, knew industry heads and "pro's" I was like pretty deep into it, but never took it far enough to film or pick up sponsors, but I definitely had the skill to take it that far, it was an important thing to me for a large portion of my life.
So I figured it was perfect time to pick up a new thing, I had been thinking about it anyways before I completely quit, would talk to skateboarders at the local I used to go to and ask them questions about boards etc. It's been 7 years and I still enjoy it, I'm terrible at it...I'm a slow learner, I'm older and feel it, basics of skateboarding are way way harder to master especially with the lack of time, never rolled my ankles ever until I started rollerplanking...but I enjoy it, it's as simple as that. I haven't wanted to strap on the old fruit boots since either. If I see a rollerblader I'll talk to them or whatever, maybe tell them I used to do it...but that doesn't make me want to start again, I've even had some tell me start again..old friends hit me up like "you still blade?" I tell them no, I skateboard though..end of conversation, seriously straight like that.
I like that flat ground is actually really fun, and challenging...on rollerblades it's really not unless you are shooting around a city. There's more options, more things to learn etc. That's why I do it, and apparently the TBI from being dropped on my head as an infant must have healed or whatever. Ntm the whole telling your parents...NVM.