thats right, sequels are not neccessary.
this movie if you look at it objectively, is even a risk to ruin indiana jones.
but like i said before, my irrational part wants the movie so bad. i have never seen indiana jones on the big screen before. besides, i saw all movies at once and not in the right order. (well, i saw ToD first, so you could say i saw them in the right order). its not like i saw RotLA on the big screen, became a fan and watched the evolution of indy during the 80's.
so, i want to see another indy movie in my generation now.
anyway, no matter how bad indiana jones could turn out to be, its going to make a lot of money. indiana jones has many die hard fans, and all those are going to go without reading critics or anything, just with a blind confidence. its a good plan to continue a trilogy twenty years later.