How many years have we all been 'hoping'?... I too lend my hope in DR improvements and it now rests with the 5D4.
Here's my take in Canon's strategy over the past 4 or 5 years:
With over-all camera technology, Canon had been behind in 3 strategic areas
i) AF technology
ii) MP resolution
iii) Wide DR
Here, in my humble opinion, is how Canon has 'corrected' its deficiencies in these three key areas:
a) With the introduction of the 5D3, Canon had at least met and may have slightly exceeded leading edge AF technology. Prior to the 5D3, there were many complaints and defections because of Canon's inferior AF-technology. These complaints have been completely silenced.
b) With the recent announcement of the 5DS/5DSr, Canon exceeded the MP resolution for DSLR's. Although the cameras are still to be introduced and much testing will occur, I believe that based on Canon's history, these cameras will likely function at a similar level as its competitors or may even exceed them when high resolution IQ is taken into consideration. Of course DR is still not a factor in its favour.
c) The next strategic area that Canon still has to address, is widening its DR capabilities. In order to remain competitive and to answer the many complaints of its customers, I really believe that there is 'sufficient competency' in Canon's management to meet or exceed the current level of leading DR technology. Based on the prior two points above, I sincerely believe that Canon is working to address this as we read this. I may be overly optimistic but I think that Canon's answer to the DR dilemma will be answered with he next iteration of the 5D.