The technical edge of a major studio is just as pronounced today as it was then; there's a good reason the NuTrek films cost what they did, for example. The benchmark has risen and while I firmly expect Axanar can hit the benchmark of broadcast-worthy Trek from the Nineties, no, I don't remotely believe it can or will compete with big-budget SF in the current era. That's fantasy.
We aren't talking big budget features. CBS isn't going to throw 190 Million at this Series, the way Paramount did for Into Darkness... We are talking about a series that will air on a platform that currently only has 100K or so subscribers.... Even if newly produced Star Trek Content can grow that to 1,000,000 subscribers, the platform would only be bringing in 6,000,000 a month. I can't see CBS green lighting this thing if it costs more than 2 million an episode..
You are thinking about this the wrong way - part of the reason for the existing of this series is marketing and narrative for the network - so the usual rules about audience don't apply in the same way - there will be no straight relationship between audience and budget - partly because its intended as a showcase for the channel - so it's likely to be *higher* than the average original content they produce. You don't have the show that will have the most focus as the test product for your new strategy look cheap.
Moreover - remember that 600,000 (if we take your figure) is the start not the end of the pie - boxsets, direct purchase, resale rights, airing rights etc.