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Your example won't work because it won't reach the if statement until script1-3 are finished executing. Script2 won't run until 1 is finished, 3 won't run until 2 is finished, and the if statement won't run until 3 is finished. So if any of them is stuck in an infinite loop, everything will be stuck.
If these were programs you were calling, you could run them in the background and monitor their progress, but that won't work for sourcing. I would look into script1-3 individually and fix the infinite loop. What you're proposing is an external bandaid to a problem that should be fixed internally.
Then I don't think there's much you can do. I would start by contacting the person who gave you the scripts and talk to them about fixing the problem. Do you know why they get stuck in an infinite loop?
I think it's possible. You can run the sourced script in a subshell, and fork that subshell to the background.
But then any changes to the environment made by the script in the subshell won't take effect in the environment of the "parent" script. Actually, this kind of takes away the point of sourcing the scripts in the first place and does not differ much from just running those scripts independently as suggested by suicidaleggroll earlier.
also, you cannot kill a sourced script, this kill will stop the "parent" shell also (because it is not a real parent, but the same process).
From the other hand you may try to start another task and kill this process in case you want to stop it completely.