Thats a good idea, have a counter for the number of keys used, and when the limit is near there could be a warning to backup your wallet - useful if doing a lot of mixing.

Guys im doing setup for a costumer, he has 1000 DASH i do the rest of job!

But when he try to start MN from his local wallet he said he get

"not capable masternode: Could not connect to xx.xxx.xxx.xxx:9999"

what could be the problem?

I updated 2 MN and 1 fresh install yesterday to .47 with no problems so im kinda confused :/

Dash price hasnt been moving violently while BTC goes up and down in USD term
https://www.coingecko.com/en/price_charts/dash/btc

yes ,Situation existed that all 22 million coins mined in 6 month by community.

From my understanding it is theoretically possible, BUT at this very moment I dont see super mega advanced revolutionary computing power any near from now.

If that scenario happen it will effect all cryptocurrency, BUT like Rux mentioned difficulty will help things out to once massive computing power is in production, we will have time to adjust algorithm of X11 in order to mitigate all blocks being mined fast...

I really dont see it happening anytime soon... and yes there should be solution if that scenario comes in range of risk management.

Lightning is centralized by design. It's something like a centralized ledger that is capable of pushing out finalized transaction states to the real ledger at anytime.

Drawbacks:
- It screws with the UTXO set, because you can't tell where the money actually is in the system
- It's 100% centralized and could be prone to regulation. I've seen them talk about this and they say if the centralized node starts to whitelist addresses or something to that effect, they'll just start another one.
- It's incredibly complicated and will be prone to errors for the first year or two
- It's not really that useful if you're paying different people with every transaction you do. It's more useful for subscriptions or companies that are paying each other all of the time.
- There's probably more, but I lost interest 

The masternode network is decentralized by design and can pretty much do anything a centralized system can do but in a completely decentralized and stable way, including fixing all of these issues with scalability they're having in a much more elegant way.

And according to ninja it's 82.6% on new version. Is enforcement still off?

Dump incoming?