Not popular anymore...it is a similar phenomenon as with the Scorpions. No rock or metal fan takes them seriously anymore apart from upper crust people that temporarily swap their office clothes for leather pants, if you know what I mean. But in the US especially, they still seem to enjoy some respect.
As for Eloy, I don't know what the members are doing now, but the band has pretty much disappeared from the map. If people refer to old German prog bands here, they usually name Can, Kraan and stuff like that. But it also depends on what media you consult. A magazine like Eclipsed holds classic prog and symphonic rock in high esteem, so you find a lot of the more obscure stuff there. Eloy though, I have not seen there so far - and the zine has been around for more than a decade and actually started as a Floyd-fanzine.