He will definitely be getting noticed by clubs above us in the pyramid and wouldn't be that surprising if he was approached in the summer. Hopefully he's too invested in our project to bugger off at this stage.
There aren't that many clubs above us who would gamble on him at this stage and who would be too good for him to turn down. Most Prem clubs will consider him too inexperienced for that level at this point in time. I couldn't name a top flight club that I think would go for him tbh. Maybe one that gets relegated though. A Norwich or a Watford or a Leeds maybe. Or more likely a West Brom or a Sheffield United I think, a big club that's under performing in our league and sees a progressive young coach doing well in this division as the answer. I think he'd be wary though - different expectations, different ownership and management set ups.
He's got a very good situation with us, for now. Better to wait longer and build his experience and his reputation I think. If he got us promoted he would be able to show what he can do at the top level. He may even end up at Liverpool, you never know, one day. He knows the club and they know him. Probably not but if he keeps progressing maybe one day, he's only mid 40s. I think he's a long game kind of person, and will not jump at the first chance to increase his salary. Reputations can go down as well as up. He's likely to manage in the Prem eventually and earn a multi-million pound salary, no need to panic and make a poor move.