So much is being said these days about screen resolution, DPIs, PPIs, High Definition, Retina Displays, etc. Aside of the marketing jargon involved here there is a trending change that is affecting on how users (our users) are seeing the web.
I am hearing many designers sharing their opinions all over the internet very self confidently sharing that it will take time for these new displays to penetrate the market and we still need to wait and see if they became a "standard". Well, here is the thing, whether they do or they do not became a standard it is irrelevant, no matter for how long the Retina Display monitors will keep the name before they are called differently. What matter here is that the new displays offer a much higher image quality, just give me a good reason users will set with lower quality displays if the new displays are out there. People will buy the monitor/laptop/tablet/phone that looks best, Apple is a good example of that.
Having said this, we have to agree that we need to design for our users, we need to make things to look good and be usable for them to enjoy their time on our sites, training courses, etc.
Designing for a minority that is growing is a good practice, you get to understand the new technologies that are arriving, it gives you an advantage point to other designers and you get prepared to cover a growing sample of users without harming the experiences of the rest of the users - if you are smart on how to optimize your images, you can mess up everyone's experience if you are not careful.
To give you a comparison, remember our pains with ie6? Of course you do. Designing specifically for a browser that less and less people was using, against all logic and standards was a painful thing to do, but we did it. It wasn't fun, but it was the job. Good thing nowadays our beloved ie6 has an internet share of 0.6% - who are you people?
We should start looking at new worflows, use more vectors in our design so that we can easily scale icons if we need adapt our designs for a specific platform. This doesn’t mean to start designing on Illustrator instead of Photoshop, it means start using smart objects and design with the awareness of eventually increasing the size and detail of our products.
Technology is changing fast, I know that sometimes is hard to keep up with all of this new hardware and software but we need to evolve and adopt our craft to the media that will display our craft, and if you are not excited about it maybe you are not in the right line of work.