LOL. It would be ridiculous to see Desmond Lim go back to Potong Pasir.
If he had stayed loyal to Chiam See Tong, that seat might be his now (despite his horrible English and his total inability to debate in Parliament). Chiam might have given the seat to him instead of Lina, and SPP might have won. Lina is a nice auntie and very matronly, but she is not electable, and even so she lost out by only 100 votes. So I dare say that Desmond dug his own grave. That was a golden ticket to Parliament. He will never get a second chance. Not in Potong Pasir and not anywhere. He is finished.
I hope WP contests in Potong Pasir and causes him to lose his deposit for the third time (hat-trick)!
Sadly, SPP cannot regain Potong Pasir as it has no other candidates and it is not capable of renewal. Unless of course Chiam contests the seat himself. But then, he is already too old and frail, and people might not elect an MP that stands a serious risk of not lasting through a full term.