It is a tough call..
On one hand, there is a risk to both the network and SBD holder due to the debt level reaching high levels. I have covered the main reasons against SBD in this post here: SBD Debt Issue - Riding the STEEM Price Roller Coaster.
As far as reasons for SBD, here is what I wrote in another post:
SBD is beneficial for merchants. Merchants are really the ones that need a 'stable' currency in order to function.
For an actual business to try and sell their goods and services (which have fixed costs to produce) they need to be able to set fixed prices. Having a stable and widely used currency will attract more merchants to sell their goods and services using the digital currency.
Merchants are beneficial to STEEM holders because "non crypto" users will have more things that they can do with their earnings from the site.
I remember trying to explain the money thing to my non crypto friends, and lots of people lost interest when they heard you have to register in an exchange, provide your bank account information, trade your SBD (or STEEM) for BTC, and then sell the BTC to get cash. I did this on behalf of many of my friends, but not everybody is going to know somebody who can do this for them.
If someone could see that they can take what they earn and go buy an i-Phone (or whatever other good/service they are interested in) in the internal marketplace using their earnings from the site - that would be huge!
One small thing that I think could help would be to introduce a way to "throttle" SBD production in ways other than the forced measures that get imposed when the debt gets too high. One simple way to do this would be to give users another payout option: 50% SP / 50% STEEM. At the very least, it would slow down the rate at which the network produces SBD, which would reduce the amount that SBD exaggerates the volatility of STEEM.