I think the future of SEIV is strong for the time being. I could care less about 3d graphic combat. I hated it in Rebellion and BOTF. The game took for ever to play those moves, and often, very often, crashed.
SEIV Spin off games are a logical and totally supportable concept. I look forward to buying and playing them.
SE V, well, who knows.
I like to think that there are always possibilities.