But, how would this change effect the wish?
The wish had malfunctioned because once Jon adopted someone else's life, he wouldn't be Jon exactly. He was now Janine.
The wish had created a loop only broken by someone adopting the original life that had started it all.
With Jon gone, would the wish apply to Janine and her next shower, Jimmy in Jon's life and his next shower, jump unexpectedly elsewhere, or fizzle out entirely?