What would DGB get out of merge mining?
Put another way, what's in it for DGB?
Put another way, why on earth would you want to send an erroneous message to the world that DGB needs somebody else's help?
DGB can only lose with merge mining, in all respects; it has nothing to gain and there is no logical reason at all to even consider it (IMVHO).
It would probably be seen as a sign of weakness, that's true, but only until it's implemented. You culd rightfully say that
talking about merge-mining per se is bad.
But if DGB became indeed, not just a multialgo coin, but the coin that has top hashrate on all algos, it'd be a totally different matter. It'd be very triky to mount a 51% attak on a multialgo coin, but it'd certainly be unfeasable on a multialgo coin merged with the biggest coins of each algo.
Seeing this in the long term: regardless of the fortunes of DGB, the other coins won't disappear, and we'll probably never see a DGB hashrate so high that it outshines all the others. Now, pretty much all decent mining hardware in the world is active, noone likes to waste money, but if most hashrate is not in our network an attak will always be possible. If all the biggest coins join up and DGB stays out it's us who are gonna suffer, not them. Merging now means not merging later, it means future-proofing the network.
As cryptos become more important, there'll be more and more people ready to spend milons, if not bilions, to break this or that coin, and merging means preventing that. So, given that all points agains merge mining hold, there's a very strong pro argument too. IMO