Yes, but… One ASIO driver can support several devices.
For example, the RME driver I use supports 3 Multiface units, that appear as one ASIO soundcard in the audio softwares.
The same with some MOTU ones.

But I think that the “problem” is not ASIO but how the firmware’s driver is made.
When I connect two LP-16 In Windows or in OS X, only one unit is seen, which is odd because each one turns well into interface mode.
This occurs only with le LP-16, all other audio interfaces I have used are at least recognized by the system, so I suppose that there is something inside the basic LP-16 driver that prevent the systems to see more than one unit.

The ASIO limit is not the problem, because Core Audio has not this limit and I can also use only one.
If the two units could be seen, I could use the aggregation provided in OS X, or use ASIO4All on Windows.
As you have said in the FAQ section, I can aggregate the LP-16 with other USB audio interfaces, so, why not two LP-16 ?

I know that the clock sync could be a problem, but for playback, it has never been an issue for me with two or three soundcards (3 ESI Gigaport HD for example).
I know also that the main purpose and interest of the LP-16 is the standalone mode, but it can be a plus for some people 😉
So, may I have yet a little hope ?