With his skating, I say the ceiling is not very high...
In the grand scheme of things though skating is more fixable than other issues. I had a bigger issue with his pinching and some reads, which are issues amplified by skating because he can't cover for them. He has to think better, but he's shown the aptitude for it, just needs more experience. Muzzin is a similar skater--clompy and of average speed--yet he's very successful.
He showed tons of promise with Doughty early on, just fell apart over time with immense minutes.
If he tops out as a 2nd-pairing d-man, that's exactly what we had hoped for, is it not? We were projecting Voynov-McNabb. ANd I think he's a decent-to-good #4 now, never mind with more development. I think this year was excellent for him from a development standpoint, just not from a results standpoint, as in playing so much with Doughty he started getting exposed.
I just think it's funny that many on this board want to dump a dude who was learning on the job for not one but TWO more d-men who will be learning on the job especially when McNabb has shown more promise than either one.