I sold my Espers about a month ago at 2 sats. I had bought a lot around 1-2 sats and some at 4-5 sats; I liked the project. But I don't think Espers will ever increase again, there is just too much downward pressure and broken promises. The minute it raises a bit everybody sells.
I think it will be like that for the first few raises, but if the project just keeps improving steadily enough, everybody who wants to sell will have sold at some point! So, it's definitely not impossible for Esp to revive, but there needs to be solid dev first..