The word single is no longer relevant. In previous decades, particularly the 60, 70s and 80s, singles were released on vinyl, and later cassette and CD, in order to achieve sales and promote an album. Releasing a single was a big task involving production and shipping just to get it in the shops. It was a big investment for record companies. They also had to market the single, get videos made and encourage radio stations to play it. The process could take months and most top artists released singles at intervals of maybe once every 4 months.
Nowadays music is just tracks, mainly album tracks, and take the form of digital downloads or streams rather a physical CD/record. The top 40 simply records the songs people are downloading and buying. A few weeks ago it was Stormzy who had all his album tracks also in the top 100 with many in the top 40. Then it was Ed Sheeran with 17 out of the Top 20. Now it's Drake's turn. In a few weeks it will be someone else. I feel it's inevitable.
I'm not sure that anything can be done. The top 40 reflects what people choose to buy, mainly by downloading, or consume by streaming. The single doesn't really exist as an entity. It may cause problems for radio stations though- at one time they could have a playlist made up largely of the top 40 singles and these were songs everyone knew. I can't see radio stations playing one Drake track after another but how will they choose what to play when the charts are dominated by Drake (or whoever).