> How easy is it to find a Scala developer if you need to expand your team compared to a Java developer?

How easy is it to find a GOOD developer? Much easier with Scala. It's not like wading through hundreds of Java resumes and interviewing them is free.

> In addition, Scala tends to run slower than Java which can have a further cost if you're scaling to many servers.

This depends on so much different factors in both Java and Scala that I'm happy to dismiss this claim as “not true”.

> Porting Java code to Android is also far easier than porting Scala code.

Really? Is there anything more to do than ProGuarding and dexing the existing code, both in Java and Scala?