The alveolar consonant /d/, like the alveolar consonants /t/ and /n/, is highly unstable in English. It will tend to change its place of articulation according to the sound coming afterwards (it will assimilate its place of articulation). In the phrase good point the sound after the /d/ is a /p/. The phoneme /p/ is made with the lips—we say that it is bilabial. For this reason the /d/ may also become bilabial. It will remain a lenis ('voiced') consonant, and it will still be a plosive. This means that it will have become a /b/. So what you will actually hear in that case is:
This can also happen if the /d/ occurs before a /b/:
It will occasionally happen when a /d/ occurs before /w/:
If the /d/ occurs before a /k/ or a /g/, it may become a /g/:
- /gʊg kɔ:l/ (goog call)
- /gʊg gri:f/ (goog grief)
This is often referred to as dealveolar assimilation, because the consonant is moving away from its normal alveolar position, to effectively become a different consonant.
The Original poster's question:
There will be no elision of the /d/ in this environemt. However we are likely to get dealveolar assimilation. Because this consonant will now be homorganic (made with the same parts of the mouth) with the following /p/, it will not be released and may be less easy to hear. There will also be some devoicing of the /d/ because of the following voiceless /p/, and so it may appear more /p/-like.
Note: I've used the British English transcription system used by John Wells in LPD for this post.