> > The current chain is effectively single threaded.
>
> This is not true, since xthin/compactblocks have been introduced we
> completely removed this bottle-neck.
> The transactions will be validated continuously, in parallel and not just
> when a block is found.
>

If I understood correctly, OP was not talking about the process inside a
node being single threaded, but instead that the whole bitcoin distributed
system behaves as single threaded computation. OP seems to be describing a
system closer to what IOTA uses, by distributing among the miners the task
of validating the transactions. Although, without more specific details, it
is hard to judge the benefits.

-- 
Lucas Clemente Vella
lvella@gmail.com