The Rangers don't have anyone who is ready to replace Lindgren. Maybe Robertson can at some point in the future, but that day isn't today. We are trying to win now, not 3 years from now.
Strome is our starting 2nd line center. Who is replacing him? The picks mean nothing. We don't need a bunch of 3rd round picks spread over 3 drafts. The condition doesn't make it much better, as the pick is 3 years out. Again, we are trying to win now. Besides that, teams can no longer put a condition on a pick based on whether or not the player re-signs.
Wallstedt is a good prospect, but not one we need as long as we have Shesterkin. Wall has shown nothing to this point to suggest he can be an NHL backup. He has spent the majority of his time this year in the ECHL and his numbers are less than impressive.
You seriously need to rethink your entire approach. We aren't trading players who are key contributors this year for a prospect who might be a backup goalie for us in a couple years, before we eventually trade him for the next shiny prospect who catches your eye.
Do you actually want to see the Rangers win, or do you just want to collect prospects forever?