I'm personally 85 slayer on 07 servers and I get a whip on average every 5.6 hours. With whips around 2.9m right now, its 520k gp/hour. I expect whips to crash more so its up to you if you wanna go for it. Just so you know, you can still get around 500k/hour at green dragons using carrallangar teleport (with decent melee stats of course).
If you're looking for a less boring way to train up your account then yes, but if you're doing it strictly for money then it's not going to be worth it. By time you hit 85 whips will be like 2M so that's maybe 250k/h and you can make around that doing green dragons.
With PvM not being worth too much in rs07, other than KBD, 85 slayers more than worth it. Not only do you have that high level in slayer, but you have access to abyssal demons, which drop abyssal whips worth over 3m each.
Yes it is worth it, it's by far one of the top tier pvm money makers, it's just the grind getting up there, and if you manage to get to 90 it'll be like a dream come true with cash, it's just the ride getting there
Only if you have a really, really, really long time to play to get 85 slayer. If you average all the money you could have been making at green drags during the time it takes to get 85 slayer, you would be shocked at how many whips you would need to get to catch up.