No, because then Jagex would have to re-design AGAIN when their next skill comes out, it's just giving them more work, why not just get it right first time rather than re-doing it again and again. But don't expect any new skills in a long time though.
To my understandance you don't get any experience from making pouches into scrolls, however you do get experience by using you scrolls. Not very much though.
As far as I can remember Zezima wasn't the first one to reach 99 in any of the 'new' skills like hunter and construction. I think there will be alot of people racing towards 99, but I don't have a clue who that could be. I guess the one with the most spare time, and the most resources will be the first. But Zezima will follow very quick.
You will get 1501 total lvl and 99 firemaking. Because summoning will give you 1 total lvl. :? Oh my gosh, I haven't realised that. Darn there goes my plan. Or I have to get 99 Firemaking before Summoning is released:p But that is not going to happen.
I don't have much spare cash, and I will not be racing towards 99, without any proper understandance of the skill. I got 6 vulture eggs though. But I want to get 99 firemaking and 1500 total together, so that no summoning till I have 99 fm. Unfortunately I find firemaking very boring.