Leongatha got a study 10 years ago which recommended to continue with the coach service instead of reviving the V/Line passenger service. The situation has changed little since then. Just because Leongatha lost its train service later than Wonthaggi did doesn't by itself justify its return. Leongatha is dairy country. Whilst there is tourist development and potential (gourmet tourism primarily), it's no way near as much as the adjacent Bass Coast region, which has Phillip Island and is also closer to Melbourne.
The better question to ask is: why Wonthaggi?
Wonthaggi is becoming the commercial and population centre of the Bass Coast shire. As an LGA, the Bass Coast is growing faster than the adjacent South Gippsland shire that Leongatha is part of - it was 2.1% for 2013-2014 vs 0% according to the ABS
. Sea-changing retirees, tourism, cheap residential land and large infrastructure investment such as the Victorian Desalination Plant & potentially more wind farms are all driving this. It deserves the attention it is being given. It's also denser - 36.6 persons/km2
vs 8.5 for South Gippsland.
Minister's visit or not, the one thing I can guarantee is that V/Line won't run a passenger train to Leongatha again. Same thing for Wonthaggi. It's all coach country down there, and both areas deserve to have coach services that are done properly.
You want a train to Leongatha? Go and help the South Gippsland Railway keep its tourist & heritage train service going between Korumburra & Leongatha.