Sure, he could. Yakupov could put it all together and become a top 6 player, too. Heck, he's almost two full years younger than Spooner.
The salient point is that nobody is going to value either asset that way until they actually start doing those things, now that they've amply proven that they can't.
It's not like the only thing holding them back has been effort or maturity/experience. There are real problems to their games that they've actively been working on, and in spite of that, they still aren't performing at anywhere near the level that they need to be to get the sort of minutes their talent ostensibly "deserves."
Spooner is, what, a month or so away from being 25? The typical prime years range for forwards is their age 24-27 seasons. Raise your hand if you think he's going to be a #1 center next year or the year after, because that's what a 60+ point center is. Look at the centers who scored 60+ points last year. Do you honestly believe that the only thing preventing Spooner from joining that list is better defense?
If he hasn't done it by the end of the traditional prime years, then the chances of it ever happening only go down from there.
Of course, no one is going to value him as someone who already has 60 points. If he was a 60 point guy making 950k that wasn't even arbitration eligible next year the ask would be through the roof.
Do you honestly believe that the only thing preventing Spooner from joining that list is better defense?
Yes. Amongst forwards, he is a guy who finished 36th in assists and 13th in primary assists last year. At 5 on 5 he was 24th and 9th. Shoot, if he was playing with real linemates last year, he could have secondary assisted his way to 60 points.
He was 149th in TOI. Because of his defense. Despite racking up those points, his line was always a possession nightmare. With less TOI comes lesser linemates. Lesser linemates are not what a playmaking C needs to score points.
And let's be clear. He didn't and hasn't deserved more minutes. In a game dominated by puck possession, he is a decided minus on that front.
He is a fast guy with very good vision and a very good pass. He has a hard but not that accurate shot. He isn't some amazing dangler to beat you one on one, but he is confident with the puck. With the puck on his stick with space (not time, just space) he can zip Marc Savard like passes all over the zone. It's a huge tease as he is somewhere in between Savard and Janney in that skill.
But, he is less than crap on 50/50 pucks...or even on pucks he should get to first. He is soft and shies away from contact.
Spooner is never ever going to be able out strength people in puck battles. But, he can play smarter and read the play better in his own zone. And at least put effort into puck battles. Maybe you still lose 60% of them... but that's better than 80% of them. If he can do that and earn 2nd liner minutes and linemates, him being able to hit 60ish points isn't crazy at all.
But, right now he is soft as soft can be. Is that something that can change? Is he a wake up call trade away from reaching his potential? Or is he a woulda shoulda? Could he thrive in a system that tries to out speed people rather than out grind them like the Bruins?
I don't have the answers to that. What I do know is that right now he is an offensive middle sixer. He has the skill to be an offensive top sixer. Time is not on his side and time has not run out.