meh there won't be a price war. Prices are already low, for those on family plans on T-Mobile at $20/line. Even France's Free Mobile that everyone is going so gaga over, charges about $30 per line, except they offer 20GB data. As a European, I know they're most "revolutionary" because of the American-style pricing - dumbed down and simple vs the usual myriad of plan choices. I think if anything, we'll see more data included in the plans rather than lower prices, just the illusion of.
Lack of infrastructure investment would be the least of Verizon's (and to an extent AT&T's) problems if it had to come on down and slash pricing to match T-Mobile and Sprint.
At the end of 2013 Verizon had $235 billion in liabilities not including the $106.1 billion in goodwill and intangible assets, which if included bring Red's total liabilities to around $341,443,000,000. Its tangible book value was -$65 billion in 2012, I think it's gotten worse since then, but it is a dividend paying stock, and they repurchase shares so investors like it