What is your deal? I've seen you post this comment almost word for word on various other sites.
You've got some good points. But a lot of your argument doesn't seem to be about those points. Your argument seems to mostly have a emotional basis to it. As if you don't like the company/ies involved for whatever reason that you don't seem to be saying.
T-Mobile just has to maintain the cdma network for a little while. Years perhaps. Customer and hardware turnover will get customers onto hspa/lte compatible hardware. A lot of MetroPCS customers already have lte compatible devices. From the google search I see that it's hardware that's able to handle VoLTE. T-Mobile can make a push to improve the lte coverage and current MetroPCS hardware will be able to work without the cdma network. In the meantime they can continue to roam onto sprints network.
The maintenance of four different networks isn't really even a big deal. With the tower equipment that T-Mobile is using and deploying is capable of running all four with either a software update or very little hardware changes. I feel that you are also being a bit disingenuous with this argument since 2GSM UMTS/HSPA and LTE are in the 3gsm family and were designed to do handoffs with each other, cdma and lte were not so much.
As for the FCC requirements you don't actually know that the fcc is going to do that. The last few years it's been the two big dogs that have been making acquisitions. Those are different stories and I wouldn't use them as examples for a company the size of the new T-Mobile. If the new T-Mobile does indeed have to give up some spectrum we won't and don't know how much.
The technical issues you listed just don't seem to be that big of an issue. This is a business move. This is about combining two companies for the synergies. The real winner here is Deutsche Telekom. Which can sell off stock slowly from the newly formed company.
You're real reasons really show through when you decided to use that last sentence "This is a terrible, terrible, idea, and the people behind it are terrible, terrible, people." So again I ask. What's your deal?