Ok now the cut-off has been postponed for 90 days..
Because the whole US midwest works with Huawei devices, and sent a clear note to Mr. Trump
Apart from that it is not about 5G, it is all about 'America first'. And when Huawei pays its "licence" just to avoid all this fuzz the Potus can have a photograph of himself grinning and saying "See how great i am!" once more.
I seriously think it is not only Trump who completely underestimates China.
Huawei as Xiaomi could build any hardware themselves, and an own App store. Downside is that a lot of 'independent' Apps are interconneected and only work with Google apps like Youtube, GoogleDrive, G. Play Music, G.Play Films, Duo, Fotos, Google Plus, G. Play books, G. play games, Gboard and so on. But the latter is the real scary thing. There is only one Android 'App store' called Google Play, and no competition. Proprietary, exclusive, and completely hegemonial.
After this stunt some will probably search for an alternative.. and it will not be the iPhone or Apple's own AppStore.