das ist eine sehr interessante frage!

@DMM
maibe it's time for first Set-Top Box with multi reception tuner module, is there any reasons why it cant be Dreambox?

some first Dreambox models had tuner modules produced by Philips(NXP),
two years ago Philips TV's started to have Hybrid tuner modules which can receive DVB-T+DVB-C (tv models marked by letter 'H' at the end of title)
some current year Philips TV's have letter 'K' at the end of model tilte, which can receive DVB-T+DVB-C+DVB-S/S2 signals

next models of Dreambox mai have next evolution modules - DVB-T/T2+DVB-C/C2+DVB-S/S2
and if posible diseq support for T* and C* modes, for cases user can have air+cable or two different cable providers

miliamber
maibe by some USB DVB-C2 Stick ....