There's no end of baffling detail here which doesn't interest me I had my doubts about seeing the Milky Way as someone viewing it from Bs of L.Yrs would see it but it would be interesting if it were possible.The problem is that even if we could,I don't see how we could identify our galaxy.But the main point of my question was: how far could we eventually see with the high performance instruments of the future & is there a limit beyond which nothing would be visible however good our instruments?

> The problem is that even if we could,I don't see how we could identify our galaxy.

Yes, that is a tricky problem, even if you're "only" a couple of billion light years away. There are a few interesting questions & answers on that topic at various sites on the Stack Exchange network.

Eg, if you were somehow transported to some random destination in our observable universe, how could you navigate your way back home? If you have a good modern database of all the known quasars, and prominent stars & pulsars of the Milky Way, it's not too hard. But if you're also transported to same random time it gets a lot harder.

Roaming the galaxy will always be impossible.They do love censorship on the Stack,don't they? Someone has deleted my controversial answer. Cosmology is becoming increasingly like a religion,& when that happens,something is wrong. The high priests don't seem to understand that extraordinary claims demand extraordinary evidence. To say that a volume of nothingness is expanding for no good reason & becoming full of virtual particles appearing from nowhere as it does so is an extraordinary claim.