Yes, what can I say was drawn here and why not. I do hope they go with Tree of Life. I also hope Kasdan will be on board which actually could be possible after his involvement with TFA. Though if it is to be flashback me being me- give me the Lost Horizon story we never got damn it (or in a future film).
I do agree Disney wouldn't invest in this unless they are able to build a new world or franchise reboot out of it. Indy does have that kind of potential but to me that lies in the 20s and 30s where the Young Indy series left off.