Considering that one of it's main competitors, Sky, owns the rights to many sproting events and it moved into BT's key markets of telephone and Internet access, could they have afforded not to attempt to try and compete to stem the migration away?
On the mobile question, although EE is far better equipped now in terms of the amount of spectrum it owns, in hindsight was it a good idea to spin off what became O2?
In terms of infrastructure, I think it might have been better for the Government to back a full fibre roll out via Openreach as it would benefit far more people and businesses.
I am still very much of the opinion that Openreach ought to be wrested from BT's control and converted to a mutually owned company that is owned by all of the providers that use it's services, including BT.
Doing this would probably put paid to allegations of favourable treatment of it's parent.
Virgin (ADSL) => Namesco => Newnet => O2 => Plusnet => Zen => Newnet => Zen => Freeola => Vivaciti (using O2 Wholesale DSL) => Xilo (C&W Wholesale) => Xilo (O2 Wholesale) => Xilo (TT Wholesale due to O2 Wholesale closure) => Zen LLU => Zen FTTP (39.5 Mbps down, 9.5 Mbps up)
Router: Fritzbox 3490
Note: I don't lay turf for anyone. astro or otherwise, all views and opinions expressed are my own based on experience.