Is a computer's DRAM size not as important once we get a Solid State Drive?

RAM chips are much faster then a SSD.

Much faster.

I don't have any hard and fast numbers, but I believe that the max read time for a standard spinning hard disk is something like 50 GB / sec, SSD is 300 GB / sec, RAM is pretty much instant.

Scratch that and read the wikipedia article on SSD's. Some interesting numbers and comparisions.

One thing to note though is that as CPU speeds increase, memory speeds are not increasing as fast. This is projected to be the next big "bottleneck" in terms of computer speed.

DRAM is much faster than SSD's Flash memory. DRAM can be written to in smaller sizes (typically 32, 64 or 128 bits) where as SSD's have a block size of 4 to 128 KBytes. A SSD's block needs to be erased before it can be reused. All in all SSDs will be slower than DRAM, so there will always be a need for DRAM.

The same analogy can be made for CPU cache vs DRAM, which is why CPU's cache size are constantly increasing.

if you are running virtual machines, you'll want as much ram as you can get. just because your hard drive is an SSD doesn't reduce the ram requirements. that just means that your battery life will improve, programs will open faster due to quicker read/write times, and your system will run quieter.