The only entitlement that I see is the entitlement of residents in the low-density suburb of Scarborough expecting a level of municipal servicing akin to the highest density parts of Toronto, despite their lack of willingness to change the predominant built form of their neighbourhoods. As a result of amalgamation, Scarborough residents have already got a great deal, with the same level of municipal servicing as the rest of the city thanks to our single-tier system, without the density to really warrant it (meaning it's subsidized by the rest of the city).
I have to disagree here. Scarborough's density is similar to that of Etobicoke and much of North York (excluding the Yonge corridor in the latter), and probably Scarborough pays about same amount of taxes per capita as Etobicoke and North York.
In terms of transit endowement, Scarborough is definitely worse off compared to the other two. Similar frequency of the major bus routes, but substantially longer trips to the subway.
Therefore, their complaints aren't unresonable. And, it isn't unreasonable to extend at least one subway line (SSE) deeper into Scarborough, to even out the subway coverage.
I'm less enthusiastic about the Sheppard extension, as I don't see that as a near-term priority.