You can't assure me of anything. Your line of thinking is playing with fire at the most important position on the team. There are no QBs under contract next year, the starter is looking to break the bank, the backup is nothing more than a journeyman, and we know next to nothing about the third guy.
If the right guy falls to 24, a guy that you feel good about moving forward with, you take him and let him sit behind Dak and Trey for a year. If they feel good about the player, moving on from Dak and Lance becomes realistic. Otherwise you're looking at potentially packaging a king's ransom worth of picks to move up next year. You mentioned needs. You can't fill needs without draft picks.
This year there are some good QBs at the top of the draft, and in all likelihood, we will have a chance to grab at least one of them. That isn't a guarantee next season. Why would you not do something to correct the problem now before it becomes something much bigger?