If The Wii U was as powerful as PS4/XboxOne would it have gotten more 3rd party support?

as much support as Sony and Microsoft?

In your opinion

Nope, remember the Gamecube? that was made WITH developers in mind, similar controller to other systems, powerful, less restrictions and still 3th party passed on it

No

Nope, it would still be ignored.

If it was very easy to port games from those other systems then it probably would get a handful more, but nothing that would make a difference. The key problem for third parties is the audience the system attracts and a more powerful Nintendo system would still be attracting a majority of the same audience a less powerful one does.

not unless it used PC architecture the same as well, then developers really wouldnt have a reason not to bring games to it because porting would be a breeze

I agree it's support would likely have been similar to Gamecube's but that's still a ton better than what WiiU has had. WiiU's support (aside from Ubisoft) is beyond pathetic.

More? Yes. Equal? No.
There would still be the issue that 3rd party games have a hard time selling on Nintendo systems.

As much as PS4/One, probably not. More than it's going to get, yes.

Maybe a little more, but not enough to make it worth taking more losses from making it more powerful.