If you bought a hard copy of vanilla sins and entrenchment, you would have a map.
Entrenchment was never a hard copy. It was digital download only, same as diplomacy. I bought a hard copy of Vanilla Sins when it came out, the normal copy, not the collector's Edition or the GOTY edition, I didn't get a tech tree map with it, nor a CD with music. So you can't claim that if you bought a hard copy you would have got one, because a lot of people didn't get one. 
Is this ever going to take off?
If they did it before with the collector's edition, they'll probably do it again.
Can we upgrade our pre-order to get a hard copy?
Yarlen stated back in October that a hard copy was to be made available and the option for pre order people to upgrade would be given.
https://forums.sinsofasolarempire.com/411978/page/6/#3010162