No, that's an example of others following many, many others in many, many other fields.
You might as well say that Paizo is following Microsoft.
If Microsoft was in the Role Playing Game business, you might have a point.
License models or subscriptions are not new concepts, but applying them to Role Playing Games (including online RPG services)
is new.
To the extent that Paizo and WotC (as WotC is currently) are related in licensing, you could argue that Paizo has learned from WotC ... specifically, what not to do. (Me, I'd argue that Paizo probably already knew that.)
The implication that WotC is leading Paizo in the area of open game licensing is seriously, seriously bizarre. Paizo is playing the part of the sane guy, backing slowly away from the meth-crazed dude who wants to go into the dark woods to find the serial killer. "Yeah, man, that's, you know, cool, but I think I'll, you know, just kinda mosey on my own way, here. Good luck with that, though."
Who came up with the OGL? The d20 License? Was it Wizards of the Coast or was it Paizo?
Yes, they are still leading. WotC is not doing the same as it used to do, but that's because they also learned and found the old model not working good enough anymore. Paizo is still following their OGL, and they also copy their d20 License and their GSL examples.
Sure Paizo is making a compatibility license but they are also using the OGL. WotC showed (past tense) game companies that this was a good thing and the OGL promoted the welfare of the game industry as a whole. So, Paizo is allowing a compatiblity license (and some might compare that to the GSL) but their game rules are OGL and anyone can use them in a book regardless of whether they sign the compatibility license.
Until Paizo abandons the 3E core rule framework as outlined in the SRD, they can't go away from the OGL. (Or maybe they could. I suppose no one ever tried.) Until someone bothers to use the Pathfinder OGL rules to create his own core handbook and his own adventure path to go with it, Paizo hasn't even a need to leave the OGL behind.
But such things are actually why WotC felt the need to leave the OGL behind - they figured out that they could earn more if they made competition with their core products (Which is Core Rulebooks, not Adventures, as it is for Paizo) harder, while still promoting additional supplemental material that relies on the Core Rules.
I think, though, that Paizo is leading the market in a different aspect:
Adventure Paths as a Core Business.
I suppose something like Adventure Paths existed before, but Paizo has made it its business model. I don't know if it was "all" Paizos idea to create these adventure paths in Dungeon, but even if it was not, their genius was to turn this into a Core business. When others used to think for quite some time that adventures don't sell well. Maybe they did not, but if you do them right, and if you create a "serialized" format, they do.
It'd doubtful that WotC can take the lead there, because part of why Paizo can lead is because it is their Core Business. Of course, that also puts a "limitation" on leadership for Paizo (at least regarding WotC), since they follow differen business models.
Maybe this is also a reason why some question WotC leadership and see it "only" as 800 lbs Gorilla - The d20 market created (or at least strengthened) an "ecosystem" of business models. You don't have to sell an entire game system to make some profit - or gods, multiple ones - you can do fine with supplements and adventures for a game system.