Total revenue will decline for the foreseeable future.
5G will be a net positive for revenue growth but mass deployment of 5G is at least a year away.
The dividend is safe for the foreseeable future if Enterprise revenue hit an inflection point over the next few quarters, i.e., accelerating losses start to reverse.
Benchmarks laid out in this article track future results. If management meets or exceeds these benchmarks the dividend is sustainable, and the stock is undervalued at today's prices.