I think dogecoin is like Tron trx currently because there's nothing much happening in the project no development or something else except for the use of payment purpose and it's cheaper, of course Doge is one of the oldest coin out there and lot of projects that was created same time has long gone, example, EOS and few other coin. I think investor are all done with such project and their interest now on another pump dump projects.
We can expect nothing meaningful to be happening to the development of doge even decades into the future because I think people just like it the way it is, even without smart contract capability it's already good enough.
on the other hand, the fact that doge is frequently used as a payment method in platform like bitpay hugely because adoption of doge coin as a payment has been there for a long time already.
it's cheap and quite low in volatility compared to other alts because decentralized holders and huge market cap which means another layer of difficulty for any manipulator to manipulate the market and make the asset volatile.
overall, it's still a meme coin, and the capability of being used as a payment I think is not something that's new, any coin, including memes, already have built-in capability to be used as a payment, it just depends on the parties involved in the transaction whether they accept it or not.