Sure, Vereen played well but didn't get his first touch until almost mid-way through the 2nd quarter (all Ridley and even Blount until then) and did most of his damage after Ridley had his fumbling issues.
QTR1:
3rd and 8 at BUF 48(Shotgun) T.Brady pass short middle to S.Vereen to BUF 39 for 9 yards (J.Rogers). Dump pass, caught at BUF 45.
Not going to access Rewind at work, but I'm sure he was on the field on at least 3rd downs previous to that point..
I don't see 'many' people saying he'll take over the backfield. And why would he when he didn't make it through Week 1 with a substantial workload? I think 'many' believe he'll reprise the joker role they'd set out for him to begin the year. And in a PPR (at the least), will have value. Even Bolden (who isn't the receiver, athlete or football player Vereen is) currently has PPR value.
Long term Bolden isn't a threat to Vereen's receiving role. He's a bigger threat to rushing roles of Ridley/Blount (likely the latter as Bolden offers a more versatile skillset).