Goh Meng Seng really likes to put words in peoples' mouths. I would invite him to actually quote someone from WP or in fact any opposition member who actually holds the view that multi-cornered fights should be encouraged.
tanwp has said it correctly that in the past, 3CFs could be avoided because opposition as a whole was not fielding enough candidates to cover the whole island, but now 3CFs are inevitable because the opposition is starting to field much larger numbers.
There is therefore no need to ask WP to be grateful that in the past, opposition parties avoided 3CFs. That was the common sensical thing to do. It's like asking car drivers to be grateful that pedestrians look left and right before crossing the zebra crossing.
As for helping WP grow, I can put the issue back to other oppo parties, and ask them why did they NOT grow as fast as WP, since they were also spared the spectre of 3CFs in the past?