But is it scalable?
If i was oracle, I wouldn't be picking out my gravestone just yet.
The reason sap got onto hana in a big way is that its database middleware has always been patchy in performance at best - so its solution is to dump everything onto ssd and main memory and access it from there.
Unfortunately this can often lead to an unscalable and unsupportable mess using tools such as the excrible ABAP language and legions of pricey consultants to keep it ticking over on hardware that costs 10 times the price for 2 times the performance.
Time will tell if this leads to real world benefits, but somehow i doubt it!