Not at all. The two carriers use two completely different sets of bands for LTE, and their phones don't support each other's LTE bands anyway. THe only band they share is the PCS band, and frankly they both have about the same coverage in the same areas in that band. T-Mobile devices can't see ESMR or BRS, and Sprint's devices don't all support AWS or Band 12. That's not even getting into the part where the 3.XG services (and all voice outside of VoLTE) are completely and totally incompatible with each other (CDMA vs GSM and all).
It would take a massive time and capital investment to merge the two networks, and likely half of each one would be dropped or divested. Including some of those overlapping PCS licenses.
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