Except the two biggest wireless providers are already also two of the biggest conventional cable/ISP corporations, so there's really not much disruption at all. T-Mobile is the only major wireless carrier that isn't. Verizon and AT&T have both been seriously neglecting older wireline infrastructure for the better part of the last 10 years, and have actively avoided installing wireline (both fiber and copper) in areas where they were supposed to (see the lawsuits in NY with Verizon). They're both ready for the change in business, and as long as they can keep regulations as loose as they currently are on wireless will be quite happy to transition. What happens to pure wireline ISPs like Charter Spectrum, Frontier, etc is TBD, but I doubt wireline dies off.