He could well be, that was definitely my first thought when it was announced. Like you allude to, Carrick did an okay job at Boro in a league that can eat through managers, think Frank Lampard has proven to be a better manager at that level mind. I do think Carrick at Boro is better than the experience Ole had in English football off the bat mind.
I think we've seen a variety of managers come in and fail there, if an Emery was available I'd be tempted by him, but outside of that the top three in odds are Glasner, Iraola, and Nagelsmann, who I'm not sure would be definite improvements on how United are playing now. Main factor would be sorting the recruitment out, which to be fair looked a lot better for them this season. I enjoy watching Bournemouth mind, think Palace have been relatively poor this year, and Nagelsmann has managed to win with Bayern, but it's almost harder not to there.
(views liable to change if he goes on like a tit on Saturday mind, strong chance Iraola being a whinging twat earlier in the season is clouding my judgement

)