Historically, the 80 Knot call was a check that the Pitot Static system was functional - i.e. the probes weren't blocked. Since then it seems to have developed into a cross check for an IAS discrepancy and perhaps other things, but it doesn't do any harm to consider the original intention for some of the SOPs that are in daily use.
I would hope that most pilots would wish not to go aviating if the Pitot Static system is not functional. I can think of two occasions in recent history when B757s became airborne with blocked pitot probes and one of them didn't make it back to the airport...
**************************
Through difficulties to the cinema