He's good no doubt. But as many times, when we as NU fans see flashes of greatness we are very quick to crown someone as the next big thing. Admit it...you've done it before. Bobby Newcombe, Thunder Collins, etc. Plus it is easy to be excited by a guy like Mo (and believe me...I'm into the hype as well) when we haven't had a 'prototype' receiver for years. We've had TE's and WB's that were posession receivers. Let's see how he does over a full season (yes I hope he goes for 1000+ and 10+) with defenses making him a top priority before we give him a 1st round selection.
As far as comparing the two it's kinda hard. Totally different offenses. Totally different receivers. I was in 2nd/3rd grade when Irving was playing, but he wasn't a 'throw it up and go get it' type receiver from what I remember.
The 'prototype' WR has changed over the past few years, especially what the NFL is looking for. Guys like Terrell Owens, Randy Moss, Mushin Muhammad have changed the position. Owners and coaches search for that 6'5", 225lb WR that can go get it (and would have been a TE in earlier years). For that reason, yes, if Mo can get decent numbers next year...he'll definitely get major attention. You can't coach size and a 40" vert, though his hands could use a little work.
But who cares WHEN he gets taken, as long as he gets taken. Example? Marcus Colston for New Orleans. Big...fast...great hands....but went to Hofstra. He got drafted in the 7th round - 250+ pick. Went from working for the roster, to 3rd wide out, to starter. He virtually has Rookie of the year locked up, and is near the top of the league in receptions, yards and TD's....even against those 1st round 'guarantees'.
Should be fun to watch Purify grow. Hopefully he can live up to what the hype and pressure that we're all building around him.