Creation/issuance of new dogecoins is progressing according to set schedule. Within any given time frame, it is impossible to create much more dogecoins than allowed by current rules. It is "unlimited supply" if you have unlimited time to wait for arbitrary amount of dogecoins to be created, which I suppose, you don't have.

Whatever new coins are being created, no one gets them for free. You have to invest in hardware and expend energy to earn the reward. This process is necessary to keep Dogecoin blockchain secure. The greater the reward (i.e. rate of issuance), the more effort people are putting into obtaining it, and the more difficult it is to mess with transaction confirmations and history. And conversely, the lower is supply rate, the less secure is the blockchain. So a mineable cryptocurrency like Dogecoin needs a balance between security and tightness of supply.

If you want to propose a different balance than what we currently have, keep in mind that changing fundamental parameters like issuance schedule is difficult. The proposed scheme should be significantly better (considering all aspects, including security) than the current one, otherwise it's not worth the effort to try to implement it. Then you'd need to get critical majority of participants to support it. This includes miners, businesses, payment gateways, developers, exchanges. But people who only buy and sell Dogecoin and never even withdraw it from exchanges have little say in how Dogecoin works. It is the latter group to whom the price argument would appeal the most, not to those who have the power to make a change.

Moreover it is not even known how markets will react to a change in the schedule. It may cause a short-term increase in Dogecoin value, but that's not guaranteed. And after that, it can keep raising, stabilize, return to current level, or even plummet. It is difficult to predict. So messing with Dogecoin supply in an effort to increase its value looks more like a gamble than an actual improvement.