I've got to agree with this. I have absolutely no idea why one of the proposed Merseytram lines was planned to go to Kirkby when it already has good bus links and is connected to the Merseyrail network. As much as I like Rotheram, this particular idea isn't practical or justifiable.
As would I, a tram-train link between Liverpool South Parkway and the airport would be extremely beneficial, as would a station in Speke. In my view, the list I've made below should be the priorities for improving rail in the region above a nostalgic vanity project. If money was no object then fine, but that isn't the case, and what money is available to the Liverpool City Region needs to be spent extremely wisely indeed.
- Construction of the proposed station in Vauxhall.
- Construction of a tram-train link between Liverpool South Parkway and Liverpool John Lennon Airport.
- Joining the Canada Dock Branch to the Merseyrail network.
- Reopening Liverpool St James station.
I'm willing to bet all of the above would probably cost between the £70m to £100m quoted in the original post (or maybe a little bit more), but they'd all be cost effective and benefit a much larger area of the city region. The only way I'd see anything similar to the Liverpool Overhead Railway being cost effective is once the Liverpool Waters development has been completed, and that's a long, long way off yet.