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The mass distribution of WD stars is explained at Why is the white-dwarf mass distribution highly peaked?. However this mass distribution shows very few stars that are about to exceed the WD limit of 1.4 Solar Masses and therefore about to explode as type 1a Supernova.

If the two merging WD theory is correct it needs two stars > 0.7 SM and there appear to be very few of them - it is much more likely there would be merges of two stars of mass around 0.6 SM resulting in more WD around 1.2 SM.

If the accretion theory (mass accretes onto WD from non WD binary star) is correct there should be more WD at higher masses on their way to 1.4 SM so they can deflagrate as type 1a SN.

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