Fact: If you raise the blocksize up to a point where people can't run their own nodes, you cannot call it a peer to peer network anymore.
get the "gigabytes by midnight" script out of your head. the rises of blocksize can grow at a natural progressive rate that nodes can cope with.
core already admit 8mb is safe..
with all the code efficiencies since 2009 (libsecp256k1=5x efficient for instance),
the fact that we are not average homeline of 512mbit/s(38mbyte/10min) ADSL, but alot more as an average now
the fact that hard drives ar cheaper
the fact that the baseline raspberry Pi is now raspberrypi3
all show that 8mb is safe and admitted as such, but even so just going to 4mb is also ok. with a few tweaks ONTOP to further becoming extra safe such as limiting txsigops to 4k per tx or less forever...
all would show that there is nothing technically hindering the ability to run a full node at home
No amount of tricks can overcome the importance of a full validating node, so forget about SPV. The moment people can't have full validating nodes the whole concept of "peer to peer cash" it's game over.
and i now hope you see why the whole filters(gmaxbuzz) bridging(lukeJrbuzz) to create a cesspit of a TIER network by going soft is something i have hate of.